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よくあるご質問 / What version of the Keil RVMDK and IAR EWARM is supported for Nu-Link?
https://www.nuvoton.com.cn/support/technical-support/faq/d592d29e-04f1-11ea-b113-05daf7eedf03/
What version of the Keil RVMDK and IAR EWARM is supported for Nu-Link? 1437114900000 Keil RVMDK: V4.1 or a later version. IAR EWARM: V5.5 or later version. Users need to install a Nu-Link driver corresponding to the Keil RVMDK or IAR EWARM.
よくあるご質問 / What is the function of LDO (Low Dropout Regulator) in the NuMicro® Family? Can LDO output be used to drive other external chips?
https://www.nuvoton.com.cn/support/technical-support/faq/d5a1c6c7-04f1-11ea-b113-05daf7eedf03/
What is the function of LDO (Low Dropout Regulator) in the NuMicro® Family? Can LDO output be used to drive other external chips? 1441790775312 The LDO mainly provides a stable operating voltage of 1.8V for use in internal circuit of a chip, including RC oscillator, SRAM, and Flash. In consideration of chip operational stability, it is not recommended that LDO output be used to drive other external chips.
よくあるご質問 / How does a user check the state before entering hard fault when a hard fault occurs on a M0/M4 microcontroller (MCU)?
https://www.nuvoton.com.cn/support/technical-support/faq/d5c135b3-04f1-11ea-b113-05daf7eedf03/
How does a user check the state before entering hard fault when a hard fault occurs on a M0/M4 microcontroller (MCU)? 1444982100000 Since the hard fault is an exception interrupt, user can search code address from the memory address recorded by a stack pointer before entering a hardfault handler, and find the hard fault according to the address. The steps are as follows: Get a starting address of the stack pointer in Debug mode; Enter the starting address to query stack of information in the memory; The stacked 7th address is the code address before entering an interrupt; View the content of the code address in the program window, which is the state before entering the hard fault. • Keil RVMDK: • IAR EWARM:
よくあるご質問 / How to allow a chip not to be reset when entering Debug mode?
https://www.nuvoton.com.cn/support/technical-support/faq/d5c99a26-04f1-11ea-b113-05daf7eedf03/
How to allow a chip not to be reset when entering Debug mode? 1444895787314 • Keil RVMDK: User can complete the setting in the Target Option window of Keil compiler environment: Select ”Not reset” in the pull-down menu of the Reset Options in the Debug tab; Uncheck the “Update Target before Debugging” in the Utilites tab. After the setup, as shown below, the chip will not be reset when entering Debug mode. User can see the current state of the chip in Debug mode under the Keil compiler environment. • IAR EWARM: The function ”Not reset and enter Debug mode” is not supported in the current IAR compiler environment.
よくあるご質問 / Before entering Power-down mode, how does a user configure I/O pins to avoid the leakage problem?
https://www.nuvoton.com.cn/support/technical-support/faq/d5cea339-04f1-11ea-b113-05daf7eedf03/
Before entering Power-down mode, how does a user configure I/O pins to avoid the leakage problem? 1443167760000 Before entering Power-down mode, the user needs to configure I/O pins based on the setting of peripheral applications. If the I/O pin function is set as PWM output, the output is high or low level depending on the state of the peripheral Power-down mode (at this time, it cannot be configured by GPIO output; to use the GPIO output again, it needs to be re-configured as GPIO output). If the I/O pin is not used, it can be set as Quasi-bidirectional mode to avoid pin floating.
よくあるご質問 / Why does the "Invalid Chip ID" error message appear and Part No. show Unknown when using the NuMicro® ISP Programming Tool connection?
https://www.nuvoton.com.cn/support/technical-support/faq/d5d3ac4c-04f1-11ea-b113-05daf7eedf03/
Why does the "Invalid Chip ID" error message appear and Part No. show Unknown when using the NuMicro® ISP Programming Tool connection? 1444978740000 In the installation folder for the ISP Programming Tool, “config.ini” records PDID (Part Device Identification Number) of all the NuMicro® series. After connection, the ISP Programming Tool will compare the PDID of target chip with the “config.ini”. If the “config.ini” gets lost or the PDID of target chip is not listed in “config.ini”, the "Invalid Chip ID" error message appears on the ISP Programming Tool, or Part No. shows Unknown. User can download the latest version of NuMicro® ISP Programming Tool from Nuvoton website.
よくあるご質問 / How can a user know which set of UART transmission is used when processing messages through printf ()?
https://www.nuvoton.com.cn/support/technical-support/faq/d5e05682-04f1-11ea-b113-05daf7eedf03/
How can a user know which set of UART transmission is used when processing messages through printf ()? 1444979220000 In the process of developing applications, user often needs to use printf () to process messages for debugging. If the UART supported by the NuMicro® series is more than one, it can be determined by defining "retarget.c" in DEBUG PORT that printf() uses which set of UART for transmission. The default is UART0. The user can change the definition of DEBUG PORT and the printf () transmission port to comply with the system architecture.
よくあるご質問 / How to set the I2S sampling frequency and select an external crystal?
https://www.nuvoton.com.cn/support/technical-support/faq/d5e7a985-04f1-11ea-b113-05daf7eedf03/
How to set the I2S sampling frequency and select an external crystal? 1446449340000 The following table lists common sampling frequency in accordance with the formula of I²S clock sources. If the system only requires a sampling frequency, the clock source can be determined by an external crystal. If two or more sampling frequencies are required, most of the chips will be limited to hardware restrictions. Each sampling frequency can only be the result of I2S clock source divider. In the NUC140 series, for example, the I2S selects 12.288 MHz as clock source and 16 bits, and the available sampling frequency are 96K, 48K, 32K, 24K, 19.2K, 16K, 12K, 9.6K, 8K and 6K. As to the 44.1K, 22.05K and 11.025K, the clock source must be changed to 5.6448 MHz. I2S_BCLK = I2S_CLK /(2x(BCLK_DIV + 1)) = SR * Length * 2 Sampling Rate I2S_BCLK (8-bit) I2S_BCLK (16-bit) I2S_BCLK (32-bit) I2S_CLK 192000 3072000 6144000 12288000 24576000 96000 1536000 3072000 6144000 12288000 48000 768000 1536000 3072000
よくあるご質問 / What is the Bit-banding feature? How to use it?
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What is the Bit-banding feature? How to use it? 1446449640000 Bit-banding is a feature supported by the Cortex®-M4 core. The NuMicro® family M4 series, such as M451 series, NUC442/472 series, and NUC505 series, all support the bit-Banding feature. The Bit-banding feature allows a bit in a bit-band region mapped to a word in an alias region, as shown below. If there is a need to modify a bit, the user only needs to modify the corresponding word to complete the bit setting. With the bit-banding feature, SRAM or peripheral registers can be mapped to the respective alias region. Through the modification of words in the alias region, the user will be able to complete bit setting for SRAM or peripheral registers without complicated setup process, thereby increasing the efficiency of bit setting. Bit-banding address is calculated as follows: bit_word_addr = bit_band_base + (byte_offset x 32) + (bit_number × 4) bit_band_base is a starting address of the alias region, byte_offset is a word
よくあるご質問 / What should be considered when using PWM output function in the NuMicro® family?
https://www.nuvoton.com.cn/support/technical-support/faq/d5ff0221-04f1-11ea-b113-05daf7eedf03/
What should be considered when using PWM output function in the NuMicro® family? 1446450540000 When using the PWM output function in the NuMicro® family, the users not only sets the corresponding pin to the PWM output function, but makes sure the PWM clock source is turned on, initializes and enables the PWM output function. Otherwise, the unstable state of the output pin may lead to leakage phenomenon. In the M451 series, for example, the user can follow the steps below to set the PWM output function: Enable PWM clock: CLK_EnableModuleClock(PWM0_MODULE); Select PWM clock source: CLK_SetModuleClock(PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, NULL); Reset PWM function: SYS_ResetModule(PWM0_RST); Set the pin or PWM function: SYS->GPC_MFPL = (SYS->GPC_MFPL & (~SYS_GPC_MFPL_PC0MFP_Msk)); SYS->GPC_MFPL |= SYS_GPC_MFPL_PC0MFP_PWM0_CH0; Set the PWM output function: PWM_ConfigOutputChannel(PWM0, 0, 180000, 50); Enable PWM output: PWM_EnableOutput(PWM0, PWM_CH_0_MASK); Start the PWM output:
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